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    Re: Troughton and Simms
    From: Alexandre Eremenko
    Date: 2013 Jan 12, 14:27 -0500

    Norm,
    
    > I just realized how TRULY wonderful the sextant vernier is. 10 seconds is
    > a very small angle,
    
    I agree that these silvered scales are
    really wonderful. One cannot appreciate this from the pictures.
    I remember my excitement when I first saw my pocket sextant scale
    through the magnifying glass.
    It reads only to 1' but the whole 150 d scale is just 3 inch long!
    
    By the way I noticed an interesting statement in the Simms
    book on sextants. He recommends using pocket sextants for all
    observations AT SEA, except the lunars.
    
    The rational is "to preserve the precious instrument from elements":-)
    
    I've never heard before that pocket sextants were used at all at sea.
    
    Norie says that the sextant is to be used for lunars, but an octant for
    altitude observations. But this is another matter.
    
    Alex.
    
    
     sight but it's really more astounding than that.  The arm
    > only moves 5 seconds to affect a visual angle change of 10 seconds. Not
    > telling the board anything new it's just that I love it all.
    >
    > Norm
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